<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=375">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding:0;
            box-sizing: border-box;
        }

        #banner{
            width: 335px;
            height: 144px;
            background: #35f;
            margin: 97px auto 0;
        }
    </style>
</head>
<body>
    <div id="banner"></div>
</body>
</html>